These moulds, if I am not mistaken, are in the hands of a Swiss museum who have no immediate plans to cast and sell the figures. I expect they will be sought after, though gauging a price is difficult. Maybe eBay.de would be the place to sell. They have different characteristics in the set, some are designed for example by Mohr which are very different to the others. You can see his designs just by looking at the catalogue, they are unmistakeable. But it is a lovely set of figures.
I have the full set fortunately, although some of my figures are missing detail in the casting and I would like to replace some. So the quality of the casting is important in the price, and of course the quality of the painting.
It will be interesting to see how you get on.